Shaking screen



Jan-9, 1923.

J. c. BugKBEL' SHAKING SCREEN.

2 skins SHEET 1.

FILED JAN.2, 192g.

J. C. BUCKBEE.

SHAKING SCREEN.

Jan. 9, 1923.

2 SHEETSSHEET Z.

FILED JAN- 2,1920.

- Fatented Jan. 9, if?

JOHN C. BUCKBEE, OF CHICAGO, ILLINOIS.

enemas seamen.

application flled January 2, 1920. Serial No. 348,748.

To all wii'omz'zf may concern:

Be it known that I,'JOHN C. BUCKBEE, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Shaking Screen, of which the following is a specification.

The main and primary object of the pres ent invention is to provide a novel form of shaking screen wherein a plurality of shaker beds are arranged in superimposed relation and in which are embodied eflicient means for absorbing the jar and shock incidental to the operation of the shaker beds. This reheves the supporting framework of the arring which arises in connection with the working of the screen, and prevents transmission of the same to the building structure in which the screen may be erected.

Other objects and advantages will appear as the nature of the invention is better understood, the latter consisting substantially in the novel construction, combination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings, and finallypointed out in the appended claims.

The invention is susceptible of embodiment in Various forms, one of which is disclosed herein as indicative of the practical application of the invention, but this disclosure is to be considered only in an illustrative and not a restrictive sense.

In the drawings- Fig. 1 is a plan view of a shaking screen constructed in accordance with the present invention, the screen fabric being omitted.

Fig. 2 is a longitudinal section thereof on the line 22, Fig. 1.

Fig. 3 is a detail elevation of one of the shock-absorbing devices associated with the screen.

Fig. 4 is a transverse sectional view on the line 44, Fig. 2.

Referring in detail to the accompanying drawings, the numeral 10 designates the supporting framework of the herein described Arranged adjacent to one end thereof is a pair of oppositely-disposed jourscreen.

nal boxes 11 in which a driving shaft 12 is mounted for rotation, power being applied tosaid shaft 12 by a driving pulley 13, or other suitable approved means.

Mounted on the shaft 12, adjacent to each end thereof, is a pairof eccentrics 14, the

eccentrics of each pair being arranged at an angle of with respect to each other,

each of said eccentrics being surrounded by i a strap 15 of approved construction and to which is attached a connecting rod 16 which extends in a rearward direction from the shaft 12.

Suitably spaced apart, and extending transversely of the framework 10, is a pair of rock shafts 17 the ends of said shafts being journaled in bearings 18 mounted on the side members ofthe framework 10 and said rock shafts l7 sustain a pair of shaking screens 19 which are arrangedin superimposed relation with respect to each other These screens may be of any approved con struction, including a shaker bed 20 with suitable screen fabric-or cloth '(not shown) applied thereto, and Yeachofsaidf --beds is provided at its under sidetwithf'a'series of perforated blocks 21 for 'receiving" a plurality. of supporting shafts '22 means of which the shaker beds 20 are supported in relation to the rock shafts 17. The rear ends of the shaker beds 20 are connected to the rear rock shaft 17 by means of a series of rocker arms -23 located in pairs at opposite sides of the shaker beds, each of which arms includes a perforated hub 24 arranged at one of its ends and a perforated head 25 located at the other end. The hubs 24 receive the rock shaft 17, the arms 23 of the upper bed 20 extending from said shaft 17 in an upward direction and having their heads 25 connected to the rear shaft 22 of shaft 17, as by means of set screws 26 a1'- ranged in the hubs of the upper rocker arms and impinging against the shaft 17. The

rocker arms 23 of the lower bed 20, however,

are free to move with respect to said shaft, the purpose of which will presently appear.

Associated with the forward rock shaft 17 is a series of rocker arms 27, each of said arms including a perforated hub 28 at one end and a perforated head 29 at the other. These rocker arms 27 are located in pairs at opposite sides of the shaker beds, the arms of each pair bein arranged in reverse relation, similar to t e reverse arrangement of the rocker arms 23. Certain of the arms 27 thereby extend upwardly from the shaft 17, and others dlepend therefrom. The peri forated heads-29 of the arms 27 receive the ends of the forwardsupporting shafts 22 for connecting the arms with the forward endsof the shaker beds 20. The hubs 28ofthe upper arms are fixedly connected to the forward shaft 17, as byset screws 28, while the corresponding hubs of the lower arms 27 are loosely mounted on said shaft '17 and,

Y therefore, free to move with respect thereto,

and each of said arms'is provided adjacent to the hub '28 thereof with an angularly-dis': posed horizontal perforated car 30. By the I reverse arrangement ofthe arms 27 of eacK ,pair,'the perforated cars 30 thereof extend across each other so that the perforations of i the ears are vertically aligned. i A tension bolt 31- passes through the aligned perfora tionsof these ears, the head of the bolt projecting below the ear 30 of the lowerjarm 27;

while the threaded endv of the bolt extends above the ear 30. of the upper arm.v A'

flanged washer 32 is carried by each bolt 31 .which the spring contacts. A pair of securing nuts 35 is arranged on the threaded end of each bolt 31, and said bolts serve to.provide the required degree of compression for the springs 33 and likewise to hold the perforated ears 30-of each pair-of arms 27 in.

yielding relation to each other.

In the operation of the hereindescribed screen rotation ofthe' shaft 12, through the oppositely-disposed eccentrics 14, will impart reciprocating motion to the shaker beds 20 in opposite directions. By reasonof the upwardly-extending rocker arms 23 and 27 being fixedly connected to the rock shafts 17,

said shafts are actuated with the movement of the upper shaker bed 20,-the arms 23 and 27 of the lower shaker bed having free move-- ment on said shafts 17. Dueto the employment of the springs 33 and their connections .with' the several pairs of opposed rocker arms 27 ,said springs will yield in the shaking movement of the screens, thus compensating for any variations in such movement,

and serving to absorb the shock and 'jar incident to the reciprocation of the shaker beds and the-other operative parts of the mech- "anism. This, therefore, prevents lost mo-' tion in the mechanism, and'the balanced disposition of all parts results in the confining v of all movement within the machine. Each screen is capable of independent movement with respect to the. other within the control of the shock absorbing mechanism constituted bythe springs 33 and their connections with the. several pairs of opposed rocker arms 27.

1. In a shaking screen, the combination of a plurality of shaker beds, a air of rock shafts on which said shaker be s are mounted, connections between said rock shafts and said shaker beds affording relative movement'between-said shaker beds, and means for reciprocating said shaker beds in opposite directions, with means incorporated in said connections for cushioning the shaker. beds in their relative movement and for preventing lost motion in' the of the mechanism. 1 I v 2. In a shaking screen, the combination of a plurality of shaker beds, a pair of rock' shafts, connections between said shaker beds and said rock shafts affording relative movement between said shaker beds, and means for reciprocating said shaker beds in oppos te directions, with spring cushioningfdevices incorporated in said connections iind adapted-to prevent lost motion in the operative parts of themechanism.

3, In a shaking screemthe combination -of a plurality of shaker beds, a pair of rock operative parts i shafts, rocker arms carried by said rock- 'shak'er 'beds' affording relative movement between said shaker beds, and'means for reciprocating said shaker beds relatively to each other, with means incorporated in said connections for cushioning the shaker beds in their relative movement and for'preventing lost motion in the operative parts'of the mechanism.

5. In a shaking screen, the-combination of a pair of shaker beds arranged in superimposed relation, supports arranged therebetween, rocker arms associated with said supports and extending upwardly and downwardly therefrom and connected'to the shaker beds, and means for reciprocating said shaker. beds relatively to each other, with means associated with said rocker arms for cushioning the shaker beds in their relative movementto prevent lost motion in the operative parts of the mechanism.

6. In a shaking screen, the combination of a plurality of shaker beds, a pair of rock shafts, oppositely extending rocker arms connected to said'rock shafts and arranged in pairs, said rocker arms affording relative movement between said shaker beds, mea ns for reciprocating said shaker beds in oppomenses site directions, a bolt carried by one of the rocker arms of each pair, and a spring carried by said bolt and serving to yieldingly oppose movement of the other rocker arm, whereby to prevent lost motionin the operative parts of the mechanism.

7. In a shaking screen, the combination of a plurality of shaker beds, a pair of rock shafts, rocker arms carried by said rock shafts and connected to said shaker beds, said rocker arms being arranged in pairs, the members of which are reversely disposed and affording relative movement between said shaker beds, means for reciprocating said shaker beds in opposite directions, the rocker arms of each pair carried by one of said rock shafts being provided with perforated overlapping ears, a bolt passing through the ears of each pair, and a spring carried by each of said bolts and interposed between the head thereof and the perforated ear of one of said arms, whereby to yieldingly' oppose separation of said arms and prevent lost motion in the operative parts of the mechanism.

8. In ashaking screen, the'combination of a pair of shaker-beds arranged in superimposed relation, ,a pair of rock shafts arranged therebetween, rocker arms associated with said rock shafts and extending upwardly and downwardly therefrom, said arms being arranged in pairs and connected to the shaker beds, and means for reciprocating said shaker beds in opposite directions, with spring cushioning devices associated with said rocker arms and adapted to prevent lost motion in the operative parts of the mechanism.

9. Ina shaking screen, the combination of a pair of shaker beds, a pair of rock shafts arranged therebetween, rocker arms associated with each of said rock shafts and arranged in pairs thereon, the arms of each pair being reversely disposed with respect to each other and connected to said shaker beds, and means for reciprocating said shaker beds in opposite directions, the

' rocker arms connected to one of said rock shafts having parallel ears, with resilient devices associated with the ears of each pair and serving to control yieldingly the relative movement of the arms thereof and prevent lost motion in the operative parts of the mechanism.

10. In a shaking screen, the combination of a pair of shaker beds arranged in superimposed relation, a pair of rock shafts arranged therebetween, downwardly extend-.

ing rocker arms carried by said rock shafts and connected to the lower shaker bed, upwardly extending rocker arms also. carried by the rock shafts and connected to the upper shaker bed, said rocker arms being arranged in pairs the members of which are reversely disposed, and means for reciprocating said shaker beds in opposite directions, the pairs of rocker arms carried by one of said rock shafts having parallel perforated ears, with a supporting element passing through the ears of each" pair and suspended from one of the ears thereof, and a spring carried by said supporting element and contacting withthe other car of the palr, whereby to control yieldingly' the relative movement of the shaker arms and prevent lost motion in the operative parts of the mechanism. I

11. A cushioning mechanism for shaking screens, comprising a pair of rocker arms reversely arranged in relation to each other, a support for said rocker arms, each of said arms havlng a projecting ear, and cusl1ionmg means supported by the ear of one of said arms and cooperating with the ear of the other arm, whereby to control yieldingly the relative movement of said arms.

12. A cushioning mechanism for shaking screens, comprising a pair of rocker arms reversely arranged in relation to each other, a support for said arms, each of said arms having a projecting ear arranged in overlapping relation. with respect to the ear of the other arm, a supporting element carried by the ear of one of said arms, and cushion ng means supported by said element and cooperating with the ear of the other arm, whereby to control yieldingly the relative movement of said arms.

13. A cushioning mechanism for shaking screens, comprising a pair of rocker arms reversely arranged inrelation to each other, a support for said arms, each of said arms having a projecting perforated ear arranged in overlapping relation with respect to the ear of the other arm, a supporting element suspended in the perforated ear of one of said arms and passing through the perforated ear of the other arm, and a cushioning spring carried by said supporting element and acting to control yieldingly the relative, movement of saidarms.

14. A cushioning mechanism for shaking screens, comprising a pair of rocker arms reversely arranged in relation to each other, a support for said arms, each of said arms having a projecting perforated ear arranged in overlapping relation with respect to the ear of the other arm, a supporting element suspended from one of said perforated ears and passing through the other ear, a coiled spring surrounding said supporting element, the ear through which said supporting element passes being disposed between said spring and the ear from which the supporting element is suspended, whereby said spring cooperates with said ears to control yieldingly the relative movement of said arms.

15. A cushioning mechanism for shaking screens, comprising an upper and a lower of said arms having a vprojecting rated ear arranged in overlapping re ati'on I to the ear of the other arm, asup orting ele- I .ment suspended from the ear 0 'the upper arm, and passing through the ear',-of the;

rocker arm reversely arranged in; relation to each other, a support for said arms,- each lower arm and a spring carried byisaid sus-.

pending element and coo rating with the. ear of the lower arm, w ereby to-control; yieidingly the. relative movement of said a 'myname 1nt arms. 7 16. A cushioning mechanism for shaking screens, comprising an. upper and a lower rocker arm reversely arranged in relation to each other, a support for said arms, each of said arms having a projecting perforated. ear. arranged in overlapping relation to the 2 is seated, said spring (lo-operating ear of the other'arm, a bolt suspended from the ear of the 11 per arm and passing through the ear 0 the the lower arm,

WItIIBS SQS.

JOHN 'O. BUCKBEE.

Witnesses: I

WM. NEVARRE CRoMwELL, 'FRANOIS K. GILLESPIE.

coiled spring arranged beneath the ear of the lower arm'and surroundin and, a washer also carried by t c bolt and said bolt,

e presence of two subscribing v 

